Control means for change-speed transmissions



June 13 1944 e. T. RANDOL CONTROL MEANS FOR CHANGE SPEED TRANSMISSIONS Filed Feb. 27, 1941 5 Sheets-Sheefl 47'TaRA EK June 13, 1944. s. 1'. RANDOL common MEANS FOR CHANGE SPEED TRARSMI SSIONS iled Feb. 27, 1941 5 Sheet-Sheet 2 ly/twra: GLENN 7. RAM/00L, fg/ 02 June 13, 1944. Q N L 2,351,067

CONTROL MEANS FOR CHANGE SPEED TRANSMISSIONS Filed Feb. 2'7, 1941 5 Sheets-Sheet 3 i6 KM Ill/I/II/l/ W June 13, 1944.

G. T. RAN DOL CONTROL MEANS FOR CHANGE SPEED TRANSMISSIONS Filed Feb. 27, 1941' 5 Sheets-Sheet 4 G'LENA/ T Kim/001., v 1075. 41-

June 13, 1944,. G. 1'. RANDOL 2,351,067

CONTROL MEANS FOR crumen SPEED wmzsmssxons Fi1 ed Feb. 27, 1941 5 Sheets-Sheet 5 Patented June 13. 1944 UNITED STATES PATENT OFFICE comor.

MEANS roa cannon-arena raansmssrons 43 Claims.

My invention relatesto change speed gearing and more particularly to improved means for controlling the changing of the speed ratios thereof.

One of the objects oimyinvention is top'rovide a control mechanism for a change speed gearing which will permit certain gear ratios to be manually selected as a group at the will of the operator and caused to be individually active by power means under the control of a second manual member.

Another and more specific object of my invention is to provide improved .control means for a change speed gearing which will permit the op-' erator to select second and high gear ratios by a hand lever and to alternately cause the ratios to be operative by successive clutch disengaging and ing having its shiftable elements actuated by' power means, a manual means for positively neutralizing the gearing at any time.

A further object of my invention is to provide improved control means for three forward speeds and a reverse gearing which can be readily associated therewith and by means thereoi' permit manual shifting of the low and reverse speed ratio elements and power shitting or the second and high speed ratio elements at the will of the operator.

Another object of my invention is to provide a control mechanism for a change speed gearing wherein a hand lever when placedin one position will permit power shifting means to be operativeat the will of; the operatorand' when placed in anotherposition will positively cause the gearing to be neutralized and thepower means to be disabled. A A still further object of my invention is to provide power shifting means for the shiftable elements of two speed ratios of a change speed gearoperated means in accordance with successive movements of a single operator-operated mem-' her which is connected to actuate the valve.

Yet another object of my invention is to provide in a power-actuated shifting mechanism for a change speed gearing means permitting the gearing to be neutralized either by a hand lever, by a foot lever or by one with the assistance of the other and also means permitting the power means and hand lever to assist each other in neutralizing the gearing.

A further object of my invention is to provide --a semi-automatic" control mechanism for a conventional automobile change speed gearing having three forward speed ratios and a reverse gearing which will facilitate simplified driving of the automobile, will be chea to manufacture, easy to install, and be operable in a manner that will not require unusual special knowledge.

Other objects of my invention will connection with the accompanying drawings in which Figure 1 is a side view oi. a portion of a motor vehicle including a change speed transmission showing a control mechanism associated therewith and embodying my invention, the parts being in neutral position; Figure 21s a top view of the gearing and control mechanism with the shiftable elements of the gearing in neutral position; Figure 3 is asectionai view taken on the line 3-8 oi Figure 1; Figure 4 is an enlarged view ofthey parts on the inside of theclosure plate, said parts corresponding to neutral condi- .'.tion oi. the gearing; Figure 5 is an enlarged side view of the transmission and control mechanism similar'to Figured but with the hand lever set in position selecting second and high speeds-and clutch pedal in clutch disengaged position; Figure 6 is another view of the parts as viewed from the inside of the closure plate, said parts being in high gear position; Figure (is a sectlonal view similar to Figure 2 but with the 'pai'ts'inhigli gear position, said view being taken, on the line ing which is so controlled by a manually-operated member that thespeed ratioswill be caused 1 of Figure 11'; Figure li'ls a view similar to Figure 5 but with parts broken away, said view showing the valve control and the parts in second gear positioml'igure 9 is a secbecome apparent from the following description taken in I tional view of the valve structures, said view being taken on the line 99 of Figure 10 and showing the parts in second gear'position; Figure 10 is a sectional view taken on the line Illl of Figure 9; Figure 11 is a view similar to Figure 8 the parts in high; gear position; Figure 12 is a sectional view similar to Figure 9 showing the position of the valve structures in high gear positive-view of the interlocking member; Figure 18 is a perspective view showing the hand control lever and associated indicating bracket as mounted on the steering column; Figure 19 is a secbut showing the valve controlling mechanism and briefly described. As best shown in Figures 2 and '7, clutch teeth II are provided on the driving shaft and clutch teeth I 9 are provided on the gear l1, said teeth being in opposed spaced relation, The portion of the driven shaft between the ciutch teeth has secured thereto a splined sleeve 20 having thereon a slidable and non-rotatable clutch collar 2| provided withinternal teeth for cooperating with teeth I8 when the sleeve is movedforwardly, or for cooperating with teeth l9 when moved rearwardly. The synchronizing means which is employed to bring either the teeth l9 or l9 and the internal teeth of the collar 2| to substantially the same speed at the time they are engaged comprises synchronizing members 22, one associated with the tlonal view taken on the line 'l9l9 of Figure 18;

Figure. 20 is a sectional view taken on the line 20-20 of Figure 18; Figure21 is a sectional view taken on the line 2 l-2l of Figure 1, showing details of the primary shut-oil valve; Figure 22 is a sectional view taken on the line 22-22 of Figure 1; Figure 23 is a detail view of the end of the clutch pedal arm and associated parts showing them in' various positions; Figures 24 and 25 are sectional views of a modifiedspring control means for the plunger and selecting finger for actuating the distributing valve element showing said finger in difierent positions; and Figure 26 .is a sectional view taken on the line 26-26 of Figure 24.

Referring particularly to Figures 1 and 2,. the numeral 1 indicates the engine for driving a motor vehicle, this engine being connected to the wheels of the vehicle by means of the usual clutch (not shown) enclosed within the housing 2 and the change speed gearing. The gearing is connected through suitable shafting and a differential gear (not shown) to the vehicle wheels as is theusual practice. A clutch pedal 9 secured to the'outer end of a shaft 4 controls the engaging and disenga ing 'of the'clut ch. The change speed gearing is embodied in a housing 9 in which is journaled the driving shaft 8 (con nected to one element of the main clutch) and .the axially aligned driven shaft 1. The portion of the driving shaft within the gearing housing driven shaft teeth 19 and the other associated with teeth IS on the second speed gear. Between these two synchronizing members are operating members 29 which lie beneath'the clutch collar 21' for operation thereby. Thus when the collar is moved forwardly to engage teeth I9, members 23 will be operated toflrst operate the synchronizing member 22 to frictionally connect the drive and driven shafts together, and

. then subsequently permit the movement of the has secured thereto a gear 8 constantly meshing with a gear 9 of a; cluster of gears mounted on a counter-shaft l0 iournaled in the housing at one side of the driving and-driven shafts. The

cluster of gears, in addition to the gear 9, in cludes a second speed gear II, a low speed gear l2, and a reverse speed gear l3, the latter being in constant mesh with an idler gear II. A portion of the-driven shaft I which extends into the housing is provided with splines 15 upon which is slidably mounted a combined low and reverse gear l6, said gear, whenmoved forward, meshing withthe gear .l-2 to obtain low speed ratio,

' and-when moved rearwardly, meshing with gear collar through the teeth of the synchronizing member to a position engaging teeth l8. Similarly, when collar 2| is moved rearwardly, members 23 will be operated to move the synchronizing member 22 so as to frictionally connect gear I! to the driven shaft and then subsequently Permit the teeth of. the clutch collar to pass and the combined low and reverse gear IS in.

order to properly control change of speed ratios of the transmission. On the side closure plate 24 for the gear housing 5 there is 'journaled a shaft 25 (best shown in Figures 1, 5 and 6) which extends to the exterior of the closure plate and has pinned thereto an o ating arm 29. To this shaft is secured, as by welding, an upwardly extending arm 21 in which ispivoted a shifting fork 28 engaging in an annular groove in the combined low and reverse gear it. Thus when the arm 26 is moved to rotate shaft 25 in a counterclockwise direction, as viewed from the exterior of the closure plate. shifting fork 28 will be so moved as to place the gear l9 in-mesh with gear l2 to obtain low speed ratio, and when the arm is turned in the opposite direction, the shifting fork will move to cause gear l9 to be placed in mesh with the idler gear I l to obtain reverse gear ratio.

Also joumaled in the closure plate forwardly of the shaft 25 is a second shaft 29 and secured to the outer end thereof is a second arm III for I rotating the shaft. The inner end of the shaft has secured thereto, as by welding, an upwardly extending arm .9! in which is pivotally mounted a shifting fork 32'" engaging in a groove in clutch collar 2|. Thus when the shaft 29 is rotated in a counter-clockwise direction. as viewed from the exterior of. the closure plate, collar 2| will be 4 moved forwardly to cause the driving shaft 6 to This structure is well known and need only be be connected directly to the driven shaft I to provide direct or high speed ratio, and when the shaft 29 is rotated in the opposite direction the collar will .be moved rearwardly to cause gear l1 to be connected to the driven shaft to provide second speed ratio.

As best shown in Figures 4 and 6, (views of the inside of the closure plate) the closure plate has mounted thereon two companion levers 33 and 34 by means of pivot pins 35 and 36, respectively. These levers extend upwardly on opposite sides of arm 3| pivotally carrying the shifting fork 32. The lever 33 is provided with an integral arm 31 and lever 34 is provided with an integral arm 38, these arms extending toward each other and having their ends 'in overlapping relation with arm 31 lying above 2.111138. By means of this. construction, when the lever 33 is moved in a clockwise direction, as viewed in Figure 5, lever counter-clockwise direction. In the event the 34 will be caused to be moved in a counter-clock- I wise direction and toward the lever 33. 'The arms 31 and 38 lie directly below the boss of shaft 23 and this boss is .provided with a flat surface 39 which is adapted 'to be engaged by arm 31 to limit the rotative movement of the two levers 33 and 34 away from each other. The extent of movement of the levers toward each other is limited by the shifting fork carrying arm 3! which lies between said levers. The levers are spread apart when fork 32 is moved from its neutral position in either direction to cause second and high speed ratios to be effective. If the levers are moved toward each other when the fork is on either side of its central or.neutral positions, arm 3i will be engaged and the fork will be moved to its central position. Thus it is seen that if the fork is in a position causing a gear ratio to be active, the transmission can be neutralized by the movement of the levers toward each other. i

vAlso journaled in the closure plate is a shaft 40 which is positioned rearwardly of shaft 29 and above pin upon which lever 33 is pivoted. The outer end of this shaft has secured thereto an arm 4|. has secured thereto an arm 42 which extends upwardly between the closure plate and the lever 33. Carried on this arm is a pin 43 for cooperationwith the end of lever 33 whereby when shaft is moved in a counter-clockwise direction, as viewed from the exterior of the closure plate, pine 43 will pick up lever 33 after a lost motion movement and rotate it with arm 42, thus causing levers 33 and 34 to be moved toward each other.

At the forward end of the closure plate is journaled a shaft 34 having secured to its outer end a detachable short arm and to its inner end an integral longer arm 46. Shaft 44 is adapted to be rotated in a counter-clockwise direction by means of clutch pedal 3, the structure for accomplishing this comprising an arm 41 secured to shaft 4 and extending upwardly adjacent the short arm 45. This arm carries a 'pin 43 for engagement with the arm 45. Therelationship between arm 41 and arm 45 is such that the pin will not engage the arm 45 until the clutch pedal has been moved to a position just disengaging the clutch. This relationship is best shown in Also, the inner end of the shaft L of arm 66 is provided with a pin "68 which is cause rotation of.arm 45 and also arm 48 in a clutch pedal is depressed still further in order to cause arm 41 to assume a third position, shown by the dotted line C, pin 48 will ride over the end of arm 45 and no longer cause movement of this arm.. The positions of the clutch pedal corresponding to positions A, 3" and C of arm 41, are shown in dotted lines in Figure 1 and similarly marked. The extreme end of arm 41, which extends beyond pin 48, carries a pin 49 which is received in a slot 53 at one end of link 5|, this link having its other end pivotally connected to a short arm 52 extending upwardly from arm 31. previously referred to and secured to the outer end of shaft 40. This connecting structure is for the purpose of permitting arm 41 to rotate shaft 40 in a counter-clockwise direction (as viewed from the exterior of the cover plate) under certain conditions'and then only when arm 41 is moved from the dotted position 3" to the dotted position C. These conditions will be later described in connection with the operation of the mechanism.

On the upper forward corner 'of the exterior of the closure plate 24 there is mounted a valve housing 53 provided with parallel bores 54 and 55 opening toward the gearing housing. In bore 54 there is positioned a cylindrical valve element 56 having an actuating'extension 57 and in bore 55 there is positioned a cylindrical valve element 58 The inner end of projection 51 has securedthereto a double. arm actuating member 82 formed with depressions 83 and 64 on one edge and a single large V -shaped recess 35 on its other edge. Loosely mounted on extension 5] between member 62 and the plate 60, is an arm 38 provided with a V-shaped selecting cam surface 61 (see Figures 4 and 1 5). The outer end adapted to cooperate with an elongated slot 83 in the end of a second arm 10 which is loosely mounted on projection 53 of valve element 53.

Also loosely mounted on the projection 53 but secured against relative movement with respect to arm 10, is still another arm H which is angularly related to arm '10 and extends downwardlyfrom the projection 59. A spring 12 is connect- .ed to arm II and the 'closure plate 24 for causing the connected arms In and H to be rotated in a counter-clockwise direction as viewed from the exterior of the closure plate (see Figures. 8

and 11). The lever H lies adjacentthe end of clockwise direction when the shifting fork isin 7 a position to cause second speed ratio to be active (see Figure 8)"; When the shifting fork is in high speed position, pin 13 will be so positioned that it will not interfere with the rotative movement of arm H and, therefore'this 'arm and arm 10 will be rotated under the action of the spring in a clockwise direction. Figure 11 shows the shifting fork and position of the pin 13 when the transmission is in'highspeed ratio with the clutch pedal depressed.

In the upper front end of the closure plate there is mounted a sleeve I4 fixed against rotation by means of a stake pin 15. Slidable in this sleeve is a plunger 16 provided with a V-shaped nose 11 at its-outer end and in the same plane as the double arm member 62 for'cooperation with the V-shape'd recess 65 of said member. The spring 19 biases the plunger toward member 62 and. when free to engage said member will cause it to assume a position to place the distributing valve element 56 in its normal or neutral positon (see Figure 4). Pivotally mounted on plunger 16 is a selecting finger 19 which extends beyond the end of the plunger and is provided at its free end with a pin 99 which is adapted to cooperate with the V-shaped selecting cam surface 61 .carried on arm 66. I The finger is normally held in an axial position with 9| whereby the passage 99 can be connected to an atmospheric passage 92 so that when the valve element is turned to a position where t e cross passage 99 is out of alignment with passage 91, passage 99 will be in communication with the atmosphere. The normal inoperative position of the valve corresponding to neutral position of the gearing is as shown in Figure 1 whereby Passage 99 is connected to atmosphere through passages 92 and I99. When valve element 59 is rotated by arm 42, it will be in the position shown in Figures 9 and 12 wherein passage 99 is connected to conduit 99. v

The valve element 56 in bore 54 is provided with two slots 93 and 94 whereby the valve element may cause the passage 99 to be connected to either passage 95 or passage 96 in the valve casrespect to the plunger by means of spring 19 g which cooperates with a small plunger 9| and forces it against the fiat end 92 of the finger. The finger, however, may swing on its pivot under the action of an external force but if freed from this force, it will always axially align itself struction (see Figure 4). The pin 99 on the end of the finger is of such length as toalso have selective cooperation with either of the depressions 63 or 64 in the double arm member 62. If

with the plunger asis obvious from the conit cooperates with depression 63, it can rotate the double arm member 62 and also valve element 56 in a counter-clockwise direction. If it cooperates with depression 64, it can rotate the valve element in a clockwise direction. The depression it will engage is dependent upon the position of the selecting V-shaped cam 61. The plunger 16 .and finger 19 pivoted thereon are adapted to be actuated byarm 46 previously re-' ferred to, said arm extending upwardly along side shoulder 93 on. the plunger. When the plunger is moved by spring 19 the V-shaped nose will engage member 62, as previously noted, and

ing, depending upon the position of the valve element. The slots 93 and 94 are so :formed as to leave a wedge-shaped portion 91 which can shut off passage 99 and, when in this shut ofi position, permit passages 95 and 96 to be in simultaneous communication with the atmosphere through a passage 99 which communicates with bore 55 opposite passage 99.

4 Positioned below the closure plate on the outside thereof is a suction motor 99 which is connected to actuate arm 39 and, by means of shaft 29, the shifting fork 32 for controlling the second and high speed ratios as previously described. This fluid motor comprises a cylinder I99 pivotally mounted on a bracket I92 secured to the clutch housing 2. Within the cylinder is a piston I93 and secured thereto is a piston rod I94 which is pivotally connected to arm-39. The piston I93 is positioned at the center of the cylinder when the shifting fork 32 is in its neutral position.

is adapted to-be connected by a conduit I96 with pin 99 on the end of finger 19 will extend beyond ,the apex of the-v-shaped cam 61. This relaa tionship is shown in Figure4.

The projection 59 on the valve element 59 has secured thereto a short actuating" arm 94 provided with a slot 85. This arm extends downwardly and along side the upper end of arm 42 which, as previously described, issecured to and actuated by shaft 49. The arm 42 carries a pin 96 which can engage in slot 95 to actuate arm 94 and consequently the valve element 59. The end of arm 94" and the slot 95 are so formed that pin 96 will pick up the arm and actuate it only during a portion of the movement of arm 42. Thus when arm 42 is rotated in a clockwise direction from its normal inoperative position shown in Figure '1, it will ,move relatively to arm- 94 and then pin 96 will n e slot 95 to pick up arm 94 and move valve element 58 to its Figures 9 and 12."

As'best shown in Figures 9. 10, 12 and 13, the rear end of valve casing 53 is provided with a passage 91 .for placing bore 55 in communication with a conduit which is'adapted to be placed in communication with a suitable source of suction, such as'the manifold of. the internal combustion engine. The valve element, 591s provided with a cross passage 99 for connecting passage 91 with a passage 99 leading to bore 54.

open position as shown in passage 96 of the valve casing associated with the distributing valve element. When the source of suction is connected to the cylinder by conduit -I95 and atmosphere is connected to the cylinder by conduit I96, the piston will be caused to move to the lower end of the cylinder and the 4 shifting fork 32 will, be so moved as to place the gearing in second speed ratio. When the source 01' suctionis connected to the upper end of the cylinder and atmosphere is connected to the lower end of the cylinder, the piston will be moved to the upper end of the cylinder and cause the 'shifting fork to be moved to a position to cause the gearing to be in high speed ratio.

Passage 99 between bores 54 and 55 has associated therewith a valve element I91 lying in a bore I99. The valve element has an extension I99 which projects out of the valve housing 53 and cooperates with the hub of arm 39 secured to the outer end of shaft 29. This hub is provided with a small depression II9 into which the extension 'can' move when arm 39 is in its neutral position. When the extension is in the depression I I9, valve I91 is forced downwardly under the action of a spring I II andthus restricts the flow of air through passage 99, the restricting positionbeing shown in-Figure 4. When arm 39 is in either of its second or high speed ratio posi- 1. tions. the hub of lever lll will hold valve I91 in an upper position so as not to restrict the passage 99 (see Figures 9 and 12). The spring III is backed by a plug 2 having an opening-H3 therethrough which places the bore in communi- The valve element is also provided with a slot cation with the atmosphere. The passage 93 2351,00? previously referred to as leading to the atmosphere, communicates with the atmosphere through the upper end of bore I03.

In order that the two cylindrical valve elements 53 and 53 may be yieldably held in their different operative positions, the? is positioned in-a bore I I4 of the valve casing a spring I I5 acting upon balls 5 and H1 (see Figures .10, 13

and 14). Suitably positioned recesses H8 in the pivoted on the lower end of the steering column I22. Similarly, the arm 4| for rotating shaft 40 is connected by a link I23 with arm I24 pivotally mounted on the steering column adjacent arm I03. The mounting of arms I2I and I24 includes arm I24 is rotated by handle I33 to a position to actuate the arm H in a clockwise direction.

There is also provided an interlocking mechanism for preventing low and reverse gears from being engaged whenever it is desired 'to employ the-second and high speed gears and vice versa. This interlocking mechanism (see Figures 4, 6 and 1'1) comprises a member I45 lying between the shafts 25 and 29 on the interior of the closure plate and pivotally mounted on said plate by a pin I46. The member I45 is provided with a bore I41 in which is positioned a spring I48 acting on balls I49 and I50 to press them apart. Ball I40 is adapted -to cooperate with recesses I5I, I52 and I53 in a flange on arm 21 carrying shifting fork 28 to yieldably hold said fork in its different positions. Ball I50 is adapted to coa bracket I secured to the steering column and lationship. These hubs receive the lower end of a a rod I23 which is both rotatable and longitudi nally slidable; The rod carries a pin I29 which isadapted to selectively cooperate with slots I30 and I3I in the hubs of arms i2I and I24, respectively. Thus the rod I23 can be selectively con nected with either ofthe arms I2I or I24 by a reciprocable movement; When either of these arms is connected to the rod it may be rotated by means of the pin and slot connection.

The rod I23 extends upwardly along side the steering column to a point just below the steering wheel I32. Secured to this upper end is a handle I33 extending to the right end of the steering wheel as viewed when the driver is sitting behind the wheel. The upper end of the rod has bearing in a bracket I34'and a spring I35 00- operates with this upper end to normally bias the rod so that pin I25 at the lower end will be connected with arm I24.. If it is desired to connect the lower end of rod I23 to arm I2I, this is accomplished by raising up on handle I33 against the bias of spring I35. The bracket I34 has a' portion extending outwardly and above the center of the steering column and in this bracket is p a slot I35 in the form of'a lower case"'h". The

operate with recesses I54, I 55 and I55 in a flange on arm 3i to which the gear shifting fork 32 is pivoted to yieldably hold said fork in its different positions. When the gearing is in neutral, ball I49 is in the central recess I52 and ball I50 is in central recess I55. Under these conditions the interlocking member I45 has some pivotal play between the confronting flat surfaces adjacent the neutral recesses I52 and I55. When the shifting fork 28 is moved to either of its operative positions, member I45 is pushed against the fiat surface on the flange of arm 3| by the-camming action of the flat surface on the flange 'of arm 21 and is held in this position by the contour of the flange on opposite sides of the recess -I5I or 153 depending on which ratio is active. When the shifting fork 32 is moved to either of its operative positions, member I against the flat surface on theflange of arm 21 by the cammingaction of the flat surface on the flange of arm 3| and is held in this locked position by the flange contour on, opposite sides of recess I54 or I53 depending on which ratio is active. Thus it is seen that the flat surface of the shifter fork arm being moved to an active position operates to force the interlocking member against the flat surface of the inactive shifter form arm, said interlocking member being held in its locked position to prevent move- 1 ment of the inactive shifter fork arm by the member I45 is provided with a laterally probracket isprovided with four markings I-Il,"

The bracket marine lower end of the steering column also has mounted thereon a primary shut-off valve I33 cmnprising a cylinder I33 mounted on the bracket and a cylindrical valve element I43'.formed as an extension of the hub of arm I24. This valveelement is provided with jecting pin I51 which is adapted to lie adjacent the hub of arm 42 carried on shaft 40. This hub is provided with a recess I53 which is so positioned that pin I 51 can engage the recess when the shifting fork 32 is in its neutral position and said arm 42 ismoved to its neutral position as determined by the setting of the gear shift handle I33 mounted adjacent the steering wheel. If the gear shifting fork 23 is moved to an operative position, then pin I51 will be caused to en age recess I53 by the flat surface camming action of flange arm 21 against interlocking member I45. Consequently arm 42, shifting fork 32 and its associated neutralizing levers 33 and 34 will be locked in theirneutral positions a slot Ill for connecting two ports I42 and I43 in one position and disconnecting them when in another poation. The port I42 is connected to by the pin I51 and member I45 and held in their locked condition by the contour of flange arm 21 as long as either low or reverse speedratio is active.

Referring now to the operation of my improved control mechanism. the parts thereof will be in.

I33 is normally in closedposition except when the positions shown in Figures -1, 2, 4 and 1s when the gearing is in neutral or inoperative position. Under these conditions the finger I31 is forced in the opposite direction also the secondary shut-off valve.

associated with the shifting handle will be opposite the point marked N on the bracket. The

primary shut-oi! valve I88 will be closed as will The distributing valve will be in a position where both ends of the fluid motor will be connected to atmosphere, this position of the distributing valve being determined by the action of the plunger 18 and V-shaped nose 'II.

If it is now desired to place the gearing in reverse speed ratio, this is accomplished by depressing the clutch pedal (in order to disconnect the gearing from the engine) and then pulling up on the handle I88 against spring I88 and rotating it. in a counterclockwise direction as viewed by the driver. This will move the pointer I31 into the end of the leg marked R. when the lever is pulled up, rod I28 is so positioned that it will be connected to arm III at the lower end of the steering column. Rotation ofshaft I28 by the handle will result in arm 28 being rotated in a clockwise direction. This will cause the combined low and reverse gear to be moved rearwardly from its neutral or inoperative position and to a position where it can engage idler of the leg ofthe h-slot marked L0. This causes the -arm 28 to be rotated ina'counterclockwise direction and thus moves the combined iow and reverse gear I8 forwardly to a position where it engages the gear I2. The tron is now in low speed ratio and when the clutch pedal is released to re-engage the clutch, the v vehicle will be moved forwardly.

Thus it is seen that the combined low and reverse gear I8 is moved solely by manual eifort in order to obtain either low or reverse speed ratio. This method of operation is not burdensome on the driver since these two speed ratios are not employed as often as the second and high speed ratios of the searing. p

when it is desired to employ second or high speed ratio, the clutch pedal is depressed in order to disengage the clutch. The extent of depression of the clutch pedal should be beyond the dispointer I8! is opposite the position marked NY? sp'ring 188 will bias the 'rod I88 downwardlyso fthat the rod is connected to arm 488 by means ofpin I28. Thus the pointer is in o position to move directly to the end of the slot-marked "m" by a m'erexotation'ofhandle I88 in a centerclockwise direction. Movement of the handle under these conditions will openthe primaryv shut-on valve I88 so that-the manifold will be in commimication'with conduit 88. The movement oflthe handle also causes the arm 4| to be'rotatedinacloekwisedirectiomasviewedinfFigurel. Thisresultsinarmflsecuredtothe ures 8 and 11. The pin 88 on lever 82 will move into slot 85 of the short arm 88 and rotate this arm so as to place valve element 58 of the secondary shut-off valve in open position shown in Figures 9 and 12. This places the cross passage 88 in the valve element in alignment with passage 81 to thus connect this passage to passage 98.

The depressing of the clutch pedal to the position marked B in Figure 1 causes pin 48 'car- I8. Pin 88 on the end of this finger 'will be caused to move into engagement with recess 64 on the double arm member 62. Movement of pin 88 into, ecess 84 is brought about by the V-shaped sel ting cam 81 carried by arm 86. The apex of this cam lies above pin 88 due to the fact that spring I2 is effective to cause arms 88 and I8 to be in their upper positions when the gearing is in neutral position, as viewed in Figure 4. The movement of plunger 16 and finger I8 to the left results, in the finger rotating the valve element 88 of the distributing valve in a clockwise direction, as viewed from the exterior of the closure plate, and to the position shown in Figure 9. This position of the valve element 58 results in the lower end of the cylinder of the fluid motor to be in communication with pas-' sage 88 which is in communication withv the manifold due to the open position of the two shut-off valves. The upper end of the cylinder of the fluid motor is caused to be connected to the atmosphere by the indicated position of the valve element. Under these conditions the piston m of tile fluid motor is pulled downwardly by the action of differential pressures and arm 88 is rotated in a clockwise direction, as viewed in Figure l. The movement of the arm causes the shifting fork 82 to be moved rearwardly and to carry with it collar II, thus connecting gear II to the driven shaft and causing .the second speed ratio to be operative.

When shifting fork-82 is moved rearwardly,

.pin 18 (carried by the fork) engages arm II and rotates this arm in a counter-clockwise direction, as. viewed in Figure 8. This so positions arms (and I8 that theV-shaped selecting cam 81 will be in the position shown in Figure 8. Also, the moving of the shifting fork to second speed ratio position causes lever 88 to be moved from its neutral position, shown in Figure 5, to its position shown in Figure 8. In this latter position it is noted .that thelever is spaced from pin. 88 on arm 82. When the gear is in second speed 'position the interlock member IlI-functions to interioroishaftbeingrotatedinaclockwisehold gear shifting fork 88 in its neutral position and prevent anyaccidental'movement.

. If the clutch pedal is now released. the vehicle will be movedforwardly bypower being trans mitted through second gear ratio. Release of the clutch pedal permits arms 48 and 88 to return .to their normalpositions, *thereby releasing plunger 18 and causing. nose 'l'l-to act on the double arm member 82'andpby reason of the V-shaped recess 88,'rotate this member so that the valve element 880! valve will again be in shown-inl'igure 1 'directionandtothepmitienindicatedinHgwn roi mss'wmbomommmm- Thismoves the plunger 18 to the left carrying it with the finger munication from the lower end of the power cylinder and both ends of the power cylinder will be connected with atmosphere.

If it is now'desired to place the change speed gearing in high speed ratio, that is direct drive, all that is necessary is to press the clutch pedal to the position marked B and then release it.

. Thehandle I33 is not moved in any manner whatsoever. The depressing of the clutch pedal causes arm 41 to again move the plunger 16 to the left. carrying with it finger 19. Since the apex of the V-shaped selecting cam 61 is now second speed ratio is to depress the pedal to the below pin 80, the pin will ride into recess 63 of the double arm member 62 and cause rotation of the distributing valve in a clockwise direction to the position indicated in Figure 12. This will result in the lower end of the power cylinder being in communication with the atmosphere and the upper end of the cylinder in communication with the manifold since the two shut-oil valves are still in open position. The piston of the power cylinder will then move from the lower end to the upper end under the action of differential pressures and cause the gear shifting fork 32 to be moved from its second gear ratio'operative position to the high speed ratio operative position. Thus gear I! is disconnected from the driven shaft and the driven shaft connected directly to the drive shaft. v

As arm 30 is rotated by the power cylinder from its second speed position shown in Figure 8 to the high speed position shown in Figure 11 the depression H0 on the hub of the arm will pass beneath the extension I09 of the restricting valve I01. When arm 30 is in a position so that the extension is in the recess, the gear shifting fork will be in its neutral position where neither the second nor high speed ratios will be effective. The restricting valve 101 will always thus cause the amount of air being drawn out of the upper end of the power cylinder to be diminished. Consequently, the piston will not move rapidly at this time. This slows up the rate of movement of the shifting fork when it' passes through neutral position. This is of considerable advantage since it permits some time for the synchronizing elements associated with the cooperative clutch teeth to be operative and bring the speeds of the teeth to approximate synchronization and thereby permit easier engage-- position marked B. This will cause plunger I6 to be moved to the left, thereby operating the valve element 56 of the distributing valve in a manner already described to cause the power cylinder to shift the shifting fork to the second speed position. The restricting valve llll will be operative during the period that the shifting fork moves through neutral position, thus slowing down the rate of movement of the shifting fork sition placing both ends of the power cylinder in close off passage 90 under these conditions and communication with the atmosphere. The parts are now so positioned that subsequent depres- I sion of the clutch pedal to the position B will result inplacing the transmission in high speed ratio. Thus it is seen that the operator of the vehicle can alternately obtain second and high speed ratios'as desired by merely depressing the clutch pedal. He need not at any time. touch the handle I33 on the steering column. When the gearing is in high speed ratio, the only gear ratio which will probably be subsequently used will be second speed ratio. If the gearing is in second speed ratio, the speed ratio most likely to be used is high speed ratio and this is obtained by merely depressing the clutch pedal. Thus it is seen that the two speed 'ratios which are used most, are quickly obtained without the use of to disengage the clutch without performing any can be driven in high speed ratio. Release of the clutch permits plunger 16 to be again positioned as shown in Figure 4 and thus cause the valve element 56 of the distributinswalve to assume its position where passage 90 is cut off and both ends of the power cylinder-are in comquently, spring I! will move arms 65. and I! to the positions indicated in Figure 1i. The

apex of the V-shaped selecting cam 61 will-thus be above pin whereby when the plunger is again moved to the left, pin ll. will move into engagement with recess M and rotate valve element 5' of the distributing valve to the position shown in Figure 9. The movement of the shifting fork to the high speed shifting operation, the clutch pedal need only be moved to the position marked a.

When the handle is moved so as to place the pointer in the end of the leg marked Hi of the I slot, second speed ratio will always. be first obtained since the spring I! normally positions the arms 66 and 10 so that the V-shaped selecting cam 61 will cause the finger to rotate element ii sired to neutralize the gearing, this can be accomplished in several ways. The clutch pedal can he moved; to the position A or "3 to disengage the clutch and the handle pulled downwardly so that the pointer is moved to the position N. This causes arm ll to be rotated back to its position as indicated in Figure l. Initial counter-clockwise rotation of arm 42 first rotates valve element 58 to a position where passage is cut of! from passage 81- and connected to atmosphere by way of passage 82. Thus the power cylinder has both ends connected to atmosphere and no differential pressure isietl'ective on the power piston notwithstanding the distributing valve element 56 may be in an 'oper- ,ative' position (clutch pedal at position "3) ,wherein one end of the cylinder, would be connected to the source of suction if the. T valve element "were not shut off. At this point pin position also carries (6 6' begins .to disengage from slot '5 of valve .by movement of either operating arm 84 since further rotation ofvalve element 58 is unnecessary and pin 43 now picks up lever 33 and moves it in a counter-clockwise direction. 4 The connection between lever 33 and companion lever 34 also causes the latter lever to move 7 in a clockwise direction. In other words, the levers are moved toward each other. If the shifting fork 32 should be in high speed condition, as shown in Figure 11, the movement of lever 34 will cause the shifting fork to be moved to its neutral position. Similarly, if the shifting fork is in second speed position, as shown in Figure 8, the movement of lever 33 will pick up the shifting fork and move it to its neutra1 position. Thus when shifting handle I33 is moved to the indicated neutral position, the powercylinder will be disabled and the gearing will be positively neutralized.

It is also possible to neutralize the transmission if in second or high speed condition by depressing the clutch pedal to the position marked 0. When this is done, pin 49 in the end of the clutch pedal actuated arm 4'! will move to the end of slot 49 in connecting rod 5| and pick up this connecting rod at clutch pedal position marked "3 and rotate arm 4I shaft 40, and arm 42 with pin 43 to thus pick up lever 33 so as to neutralize the gearing in the same manner as though arm H were moved. by the gear shift handle I33. If the clutch pedal is used solely to neutralize the gearing, the handle I33 will be automatically returned to its neutralposition.

In addition to neutralizing the transmission the clutch pedal in the manner already indicated, it is possible tov use the handle and ing mechanism are mounted on the closure plate the handle I33 or pedal in conjunction with each other. In other words, if the operator finds some resistance in neutralizing the transmission when the handle is moved, he may also step on the clutch pedal and move the pedal to the position, C. Thus both the pedal and the handle workin conjunction with each other to rotate the arm 4| and neutralize the transmission. Whenever the handle moves back to its neutral position, the primary shut-oil! valve I33 as well as the secondary shut-off valve 53 will be closed. Thus it is seen that in the neutral position of the transmission two shut-off valves are operative to absolutely prevent the source of suction from communicat ing with the power cylinder. In addition to this, the distributing valve 36 is also positioned to prevent. any communication when the clutch pedal is in clutch-engaged position, thus making three valves which are in position .to cut of! the sourceof suction from'the fluid motor.

If it is desired to have--the power cylinder assist in moving the shifting fork 32 to neutral position, this can be done by movingthe clutchpedal to the position marked B and at the same time move the handle toward neutral position. This operaton will cause the power cylinderto begin to shift the shifting fork from its operative position through neutraland to its other operative position. The simultaneous movement of the handle with the movement of the pedal will close the primary and secondary shut-oil valves and, consequently, the power cylinder will not carry the shiftingfork past the neutral position as the power will become ineilective at that point due to the closing of the shut-0H valves. 7

From the above description of my improved change speed gearing control mechanism it is seen that the structure is simple in operation .and construction. The control valve and shift- .trol mechanism is so arranged that whenever the shifting handle is moved to the position marked N," the driver will know that the gearing is in neutral position. Thus there isno possibility of the driver not knowing the condition of the trans-' mission, that is, whether it is neutral or in a gear ratio operative position. Since present change speed gearings of the conventional type now have such second gear ratios that it is very seldom necessary to use low speed ratio except on heavy pulls, the control mechanism permits substantially all the shifting to be performed by merely operating the clutch pedal. To start the vehicle the driver need only place the handle so that the pointer is in Hi position. Second gear will then be caused to be operative when the clutch is depressed. When it is desired to place the transmission in high speed ratio, it is only necessary to depress the clutch pedal. Thus it is seen that when there are no heavy pulls, the

operator need only make the initial setting of function in maintaining the selecting finger nor- .l

mally in an axially aligned position; This functionis accomplished by a small leaf spring Ill carried on the plunger and engaging a convex surface on the pivoted end of the selecting finger.

When the finger is rotated out of its normal position shown in Figure 24, the leaf spring is deformed as shown in Figure 25, so that the spring tension will return arid hold the selecting finger in axially aligned position when released. Being aware of the possibility of modifications in the particular structure herein described without departing from the fundamental principles of my invention, 1' donot intend that its scope be limited except as set forth by the appended Having fully described my invention, what I l claim'asnewand-desiretosecureby Letters Patent 0! theiUnitedBtates is:

1. In a control mechanism for a change speed on provided with a member shiftable to twogear ratio operative positions and to a. neutral position, means for'shiftmg'saidmem her, control means for said shifting means including a member, means for sooperatingsaidcontrolmeambysaidmanbfl f member thatthe shiftable member: will be moved. alternately from one operative position to the other by successive movements of the manually- =operated member, means comprising a second manually-operated member for moving the shiftable member to the neutral position from an operative position and independently of the first manually-operated member, and means ,co'ntrolled by the movement of the said second necting means .ior positively moving the shift- ,dition said control means to be operative, and

mechanical means'between the manual member and the shiftable memberwhich is operable when the manual member is moved back to its inoperative position for positiv ely moving the shittable I able member to neutral position irom an operative position independently ot-any operation of the control means when the manual member is moved back to its inoperative position.

6. In a control mechanism for a change sp ed transmission provided with a member shiitable to a two gear ratio operative positions and a central member to neutral position from an operativeposition independently of operation oi the control means.

. 3.- In a control mechanism for a change speed neutral position, .control means ior shifting said member comprising a fluid motor, a control valve and means including a manually-operated member for actuating said control valve so as to cause the fluid motor to alternately shift the shiitable member to its operative positions at will, a shutoif valve for disabling the control means, a sec"- ond manual member connected to the shut-off valve and having an inoperative position wherein the shut-oil valve is closed, means for moving the shut-oi! valve to open position by a movement oi'the second manual' member, means for closing'the shut-oi! valve and positively moving transmission provided with a member shii'table to two gear ratio operative positions and a central neutral position, control means for alternately shifting said member to its two operative positions including an element movable in opposite directions and means for causing said ele-. ment to alternately move in said opposite directions at the will of the operator, a manual member movable from a normally inoperative position to another position for conditioning said control means to be operative, and mechanical conactuate the control valve.

the shiftable member to neutral position from an operative position when the second manual member is moved back to its inoperative position or by a movement oi the first manually-operated member to a position other than that required to "I. In a control m'echanismfor a change speed transmission provided with a member shiftable to two gear ratio operative positions and to a neutral position, means for shifting said member, control means i'or said shifting means including a manually-operated member, means for so necting means between the manual member and the shiftable member which is operable when the manual member is moved back to its inoperative position for positively moving the shiitable member to neutral position from an inoperative position independently of operation of the con-. trol means.

'4. In 'a control mechanism for a change speed transmission provided with a member shiftable to two gear ratio operative positions and a central neutral position, control means for shifting said member alternately at will to its gear ratio positions. including a power-operated member movable back and forth between two operative positions and through a central inoperative position, a manual member independent of the control means and having .a normally inoperative position, means operable by said manual membef when moved from the inoperative position to another position for conditioning said control means to be operative, and mechanical connecting means operable when the manual member is moved back to itsinoperative position for positively moving the shiftable member to neutral position .fror'n an operative position independently of any operation of the control means and to also place the power-operated member in the central inoperative position.

5. In a control mechanism for a change speed transmission provided with a member shiftable to two gear ratio operative positions and a central neutral position, control means for shifting said member including a fluid motor, a control valve and operator-operated means for actuating said control valve 50 as to cause the fluid mooperating said control means by said manualmember that the shiftabie member will be moved alternately .Irom one operative position to the other by successive movements of the manuallyoperated member, and means for so mechanically connecting the manually-operated member to the shiitable member that the said shiftable member will be .placed in the neutral position by movement of the manually-operated member to a position other than that required to move the shiftable member to an operative position by the control means.

8. In a control mechanism for a change speed transmission provided with a member shiftable to two gear ratio operative positions and a neutral position, a fluid motor havingits movable element directly connected to the-member for shifting said member from one operative position to the other through. the neutral position,

a source or diilerential pressure, valve means for controlling said fluid motor, a manuallyoperated member for actuating said valve'means, means for so controlling said valve means by successive operations of the manual member that the fluid motor will alternately shift the.

shiftable member from one operative position to another, a shut-ofl valve between the source and the motor, and manual'means for opening said shut-oil valve and conditioning the control ling means so that the first named valve means may be operated by the first named manually-' operated means.

9. Ina control mechanism for a change speed transmission provided with a member shiftable to two gear ratio operative positions and a neu- .tral position, afluid motor for shifting said member, a source of v differential pressure, valve means for controlling said fluid motor, a manually-operated member for actuating said valve means, means for so controlling said valvemeans by successive operations of the manual member that the fluid motor will alternately shift the v shiftable member from one operative position to another, a shut-off valve, and means comprising a secondmanually-operated member so mechanically connected to the shut-oil valve and the shiftable member that said valve can be closed and the shiftable member subsequently moved to neutral position independently of power by the fluid motor.

10. In a control mechanism for a change speed transmission provided with a member shiftable to two gear ratio operative positions and a neutral position, a fluid motor for shifting said member, a source of difierential pressure connected for communication with the fluid motor, valve means for controlling the operation of said fluid motor by said source, a manuallyoperated member for actuating said valve means, means for so controlling said valve means by successive operations of the manual member that the fluid motor will alternately shift the shiftable member from one operative position to a.n-.

other, and means for moving the shiftable member by manual effort to neutral position by a movement of the manually-operated member to a position other than that required to control the-valve means.

11. In a control mechanism for a change speed transmission having a shifting fork for shifting an element of the transmissioninopposite directions from a neutral position to cause different speed ratios to be operative, a fluid motor for shifting said fork, control valve means, a pedal for controlling the valve means, and-a connecting means between the pedal and shifting fork, said connecting means being operable by the pedal when moved beyondlthe pgsition for normally controlling the valve for causing the shifting fork to be moved to its neutral posi tion from an operative position.

12. In a control mechanism for a change speed transmission having a shifting member for 14. In a control mechanism for achange speed transmission having a shifting member for shifting an element of the transmission in opposite directions from a neutral position to cause different speed ratios to be operative, a fluid motor for shifting said member, control valve means, a manually-operated member for controlling the valve means so as to cause the speed ratios to be alternately operative, a shut-off valve, a second manually-operated member mechanically connected to said shut-oil? valve -to open it by a predetermined movement, and means operable when the said second manually-operated member is moved to close said shut-oil valve for causing the shiftable member to be manually. moved to neutral position.

15. In a control mechanism for a change speed other by successive movements of the manuallyshifting an element of the transmission in opposite directions from a neutral position to cause different speed ratios to be operative, control means for shifting said member including a pedal, a hand lever, and means for so connectin the pedal and the hand lever to the shiftin member that either can be employed by manual efiort independently of manual effort on the other to move said shifting member to a neutral position from either operating position or either can be employed to assist the manual'efl'ort applied to the other in so moving said shifting member. 3

'13. In a control mechanism for a change speed transmission provided with. a member shiftable to two gear ratio operative positions.

and to neutral position, means for shifting said.

member, control means for said shifting means including a manually-operated member, means for so operating said control means .by .said manual member that the shiftable member will be moved alternately from one operative. position to the other by successive movements of the manually-operated member, a second manuallyoperated member, means controlled by said second manually-operated member when moved from one position to a second'position for condi-- be moved to its neutral position from either operativ position.

be placed in operated member, a pair of companion levers positioned 'on opposite sides of the shiftable member, and means operable independently of operation of the control means for moving said levers by manual effort toward each other to cause the shiftable member to be placed in neutral position.

16. In a control mechanism for a change speed gearing having amember shiftable to gear ratio operative positions. from a central neutral position, means for shifting said member, control means for said shifting means including a manually-operated member, means for so operating-said control means by said manually-operated member that the shiftable member will be moved alternately from .one operative position to the other by successive movements of the manuallyoperated member, a second manually-operated member, a pair of companion levers positioned on opposite sides of the shiftable member, and means for moving said levers toward each other by operation of the second manually-operated member only to cause' the shiftable member to neutral position by manual effort only.

17. In a control mechanism for a change speed transmission having a fluid motor the movable element of which is shiftable in opposite directions for causing either of two speed ratios to be operative, a source of differential fluid pressure, control valve means for connecting both ends of the-fluid motor to atmosphere or either end to the source, means for normally positioning the valve means so that both ends of the fluid motor are connected to atmosphere, a manually-operated member. means operable by a reciprocable movement of the manuallyoperated member for so moving the valve means' that one end of the fluid motor is connected to the source' whereby the said motor will cause one speed ratio to be operative, means operable by a like successive reciprocable. movement of the manually-operated member for so moving the valve means that the other end of the fluid motor is connected to the source whereby saidmotor will cause the other speed ratio to be operative, and means for restoring the valve means to its normal position after eachreciprocation of the manually-operated member.

shut-oil valve means between the source member connected tosaid 18. In a control mechanism fora change speed transmission havinga fluid motor the movable element of which is shiftable in opposite directions for causing either of two'speed ratios to be operative, a source of differential fluid pressure, control valve means for connecting both ends of the fluid'motor to atmosphere or either end to. the source, means for normally positionving the valve means so that both-ends of the-- fluid motor are connected to atmosphere, a; manually-operated member, connecting means between the manually-operated member and the valve means-including selecting means for causing the valve means to beso operated by successive reciprocable movements of the manuallyoperated member that the ends of the flu d motor will he alternately connected to the source and thus cause the two speed ratios to be alternately operable at the will of the operator, a andthe fluid motor, and means for manually closing said shut-oil valve and simultaneously neutraliz- 'ing an operative speed ratio,

19. In a control mechanism for a change Spe d transmission having a fluid motor the movable element of which. is shiftable in opposite directions for causing either of two speed ratios to be operative, a source of differential fluid pressure, control valve means connecting opposite ends of the fluid 7 motor to the source, a manuallyoperated member, connecting means between the manually-operated member and the valve for operating the valve, means for causing the connecting means to be so connected wtih the valve that successive movements of the manuallyoperated member will result in the 'movableelement oi the fluid motor being moved alternately in opposite directions to thus cause the two gearratios to be alternately operative at the will of the operator, and connecting means between the manually-operated member and the movable element for-moving the movable element of the fluid motor toits central position by-a movement .of the manually-operated member to a position other than that necessary to operate .the valve.-

20. In a control mechanism for a change speed transmission having a fluid motor the movable element of which is shiitable in oppos te direct ons for causing either of. two speed ratiosto be operative, a source of diiierential fluid pressure.

' ratios, means fort the second shiftable valve for shutting off the source of pressure, a pedal, means operable by successive reciprocable movements of the pedal for causing said first valve to alternately place opposite ends of the fluid motor in communication with the source or pressure to thus cause the shiitable member to be alternately moved to its gear ratio operative positions, a hand lever for opening said shut-oil valve, and means operable by said hand lever when moved to close said valve for positively moving said shiitable member to its neutral position from an operative position.

22. In a control mechanism for a change transmission provided with one member shiftable to two positions for obtaining low and reversespeed ratios and a second member shiftable to two positions for obtaining second and high speed nected. .to shiIt the. first shiftable member to either position, means for shifting the second member to either position and comprising a second manually-operated member, means controlled bythe first manual member when placed in a single position other than a position operating the first named shiitable member-for permitting the second named manual member to so control the second shittable member that second nately operative by successive movements thereof and without movement of the first manual member, and means controlled by the ,flrst manualmember for positively moving by manual ef-' tive position iroman operative position and independently oi the second manually-operated member.

23. In a control mechanism for a change speed transmission having two gear -ratios and provided with a member shiitable to either gear ratio operative position and to a central neutral position, control means for shifting said member, a manual member independent of the control means and having a normally inoperative position, means operable bysaid manual member when moved from the inoperative position to another position to condition said control means to .be operative and when operated to cause the lower gear ratio to be first made operative and control valve means connecting opposite ends of the fluid motor to the source, a pedal, connecting means between the pedal and the valve for operating the valve, means for caus' g the pedal and the connecting means to so move the valve when the'pedal is depressed and then released that one end or the fluid motor-is connected to the source and for causing the pedal and connecting' means to so move the valve when the pedal is again depressed and then released that the other end of the-motor is connectedto the source, and means for conditioning the valve means so as to disconnect both ends of the motor from the sourcewhen the pedal is in released- 21. In a control mechanism for a' change speed transmission provided with a membeishiftable to two gear ratio operative positions and a neutral position, a fluid motor having a movable V shiitable member and movable in opposite directions for causing the two gear ratios to be operative, a source 0! diilerential fluid pressure, a valve for connecting said source to either end of the fluid motor, a secondwhen subsequently operated to cause the gear ratios to. be alternately operative all without movement of the manual member from said other position, and means operable when the manual member is moved back to its inoperative position for manually "inoving the shiitable member to neutral position from ,an operative position independently of operation of the control means and to also condition said control means so that when the manual member is again moved to a position permitting the control means to be operative the lower gear ratio will be caused to-be operative upon initial operation of the control means.

24. In a control mechanism for a change speed transmission having more than two speed'ratios and with two of the gear ratios controlled by a shiItable member, means for shifting said memher to its-two diilerent operative positions and comprising a power-operated member and a control means for said power-operated membe, a pedal for operating s'aidcontrol means so that successive-depressions otsaid pedal will cause the power-operated member to place the shiitable' member in positions wherein the two speed ratios are alternately operative, manually operable means for disabling the power means and simulspeed including a manual member conmember to an inoperataneously causing by manual eil'ort only the shiftable member to be moved to neutralize a speed ratio if operative, and means operable by said manually operable means for manully controlling the operativeness of another speed ratio of the transmission when it is in a position causing the erativeness of the control means and the power device, said control means and power device being inoperative when said manual means is in one position and capable'of operation when said manual means is in another position, means controlled by the manual means when moved to the first named position for placing the shiftabie member in neutral position by manual effort and means controlled by said manual means when moved to still another position for manually op erating a change speed ratio different from the change speed ratios operated by the power device.

26. In a control mechanism for a change speed transmission provided with a member shiftable to two gear ratio positions and a neutral position,

power means for shifting said member, control means for said power means, means for controlling said control means so as to cause the power means to alternately shift the shiftable member from one operative position to another, manually-operated means for conditioning said control means so that said-means can be controlled to cause the power means to shift the shiftable member to either of its gear ratio operative positions, and means other than the manually-operated means and operable independently of any movement of the manually-operated means for placing the shifting member in its neutral position by manual effort.

27. In a control mechanism for a change speed transmission provided with a member shiftable to two gear ratio positions and a neutral position,

power means for shifting said member, control means for said power means, means for controlling said control means so as to cause the power means to alternatel shift the shiftable member from one operative position to another, manuallyoperated means for conditioning said control means so that said means can be controlled to cause the power means to shift the shiftabie member, means operable by the manually-operated means when placed in a non-conditioning position for placing the shifting member in its neutral position, and means other than the manually-operated means for also placing the shifting member in its neutral position.

28. Ina control mechanism for a changespeed transmission provided with a member shiftable to two: gear ratio positions and a neutral position, power means for shifting said member, control means for said power means, apedal for so controlling said control means by successive reciprocations thereof that the power means will alterthat said means can be controlled by the pedal to cause the power means to shift the shiftable member, and means controlled by a movement of the pedal beyond a position where the control meansis operable to thereby place the shiftable means can be controlled by the pedal to cause a the power means to shift the shiftabie member, means controlled by a movement ofthe pedal beyond a position where the control means is 0perable to thereby place the shiftable member in its neutral position, and means controlled by the hand-operated means when returned to a nonconditioning position to cause the shiftable mem-- her to remain in the neutral position.

30. In a control mechanism for a change speed transmission provided with a member shiftable to two gear ratio positions and a neutral position and having associated therewith a main pedalactuated clutch, power means for shifting said member, control means for said power means, means for so controlling said control means by successive reciprocations of the clutch pedal to a position beyond clutch-disengaged position that the power means will alternately shift the shiftable member from one operative position to another, hand-operated means for conditioning said control means so that said means can be controlled by the pedal, and means controlled by a movement of the clutch pedal beyond the position necessary to cause a shifting operation to be performed for placing the shiftable member in its neutral position. i

31. In a control mechanism for a change speed transmission provided with a member shiftable to two gear ratio positions and a neutral position and having associated therewith a main pedalactuated clutch, power means for shifting said member, control means for said power means, means for so controlling said control means by successivereciprocations of the clutch pedal to a position beyond clutch-disengaged position that the power means will alternately shift the shiftable member from one operative position to an-,

other, hand-operated means for conditioning said control means so that said means can be controlled by the pedal, means controlled by a movement of the clutch pedal beyond the position nately shift the shiftable member from one operativeposition to another, manually-operated necessary to cause a shifting operation to be performed for placing the shiftable member in its neutral position,- and means for retaining said "shiftable member notwithstanding movement of ,the pedal beyond in its neutral. position clutch-disengaged position.

32. In a control mechanism fora change speed transmission having more than two speed ratios with two of the ratios being controlled. by one shiftablemember and at least another speed ratio being'controlled by another shiftable member, power means for shifting said first shiftable member to cause either of the two speed ratios to be operative, control means for the power means, a manually operable lever having a neutral position, means for manually moving the means for conditioning said control means so 76 other shiftable member by a movement of the tion;

said power cylinder, manual means for controllever from its neutral position, and means for conditioning the control means by a movement oi the lever to a second position other than neutral so that said control means can be controlled at will to cause the power means to altematelyshift the shiitable member of the two speed ratios, said power means being inoperable by its control means whenever the lever is in the neutral position.

33. In a control mechanism for a change speed transmission having more than .two speed ratios with two of the ratios being controlled by one shiitable member and at least another speed ratio being controlled by another shiftable'member, means comprising a pneumatically-operated.

mechanism'ior automatically shitting said first shiitable member to cause at-will either of the two speed ratios to be operative, a manually operable lever having a neutral position, means for manually moving the other shiitable membaby a movement or the lever from its neutral matic means by a movement or -Qth'e lever to a second position other than neutral sothat said automatic means can be controlled to cause the ling said valve means so as to cause the power cylinder to shift the shiftable member at will from one operative position to another, other manually operable means movable from one position'to another for conditioning said control valve means so that said valve means can be controlled by the first named manual means tocause the power cylinder to shift the shiftable member, and means operable by a movement of said other manually operable means from its conditioning position for causing the valve means to be inoperative, said shiftable member to be placed in neutral position by manual eflort only and the movable element of the power cylinder to be placed in .its central position; s

37. In a control mechanism for a change speed transmission having a fluid motor themovable element ,of which is shiftable in opposite direcposition, and means for conditloning'the autopneumatically-operated mechanism to shift the tions for-causing either of two speed ratios to be operative, a source of diflerential' fluid pressure,

control valve means including a valve element.

movable alternately between two positions for connecting opposite ends of the fluid motor to the source, a movable member, means for so connecting the memberwith the valve element that successive moving and releasingof the member will cause-alternate positioning of the valve ,element, and means for positively causing said valve elementvto' be in a position so as to dis-- connect both ends of the mo'tor from the source whenever the member is in released position.

-38. In a control mechanism for a change speed transmission having more than two speed ratios with two of the ratios being controlled by one shift'able member and at least another speed ratio'being controlled by another shiitable memsource, a movable member; and means for so connecting themember with the valve element that successive movements of the member will cause alternate positioning of the valve element,

said means including means conditioned by the f position of the movable element of the fluid I motor for predetermining the movement oi the valve element by the said movable member.

35. In a control mechanism for a change speed transmission provided with a member, shiitable to two gear ratio operative positions and a neutral position, power means for shiiting said member, control means for said power means, manual means for controlling. said control means so as to cause the power means 'to alternately shift the shiftable member. from one operative position to another, other manually-operated means movable from one position to another for conditioning said control means only andwithout movement of the shiftable member from its new tral position so, that said control means can be I controlled by-theflrst named manual means to cause the power means to-shiit the shiitable .member, and means operable by said othermanually-operated means for disabling the control means and for manuallyshiiting y moved from its control 36. In a control (or a change speed positions and a neutral position, apower cylinder including a movable element having a central positioncorrespending to neutral position of the shirtable member and movable in opposite directions for sh ting said member,

' transmissionprovlded with a member We to two gear ratio operative ber, power means for shifting said first shiitable member to cause either or the two speed ratios to be operative, control means for -the powermeans.

a manually operable lever having a neutral position, means for manually moving the other shiftable member-by a movement of the lever from its neutral position, means for conditioning the control means by'a movement of the lever to a second position other than neutral so that said means can be controlled to cause the power means to shift. the shlftable member of the two speed ratios,

locking means for the second shiitable member,

said shiitable member to 'a neutral position by manual eflort when said manually-operated means is means conditioning posi-' and means operable when the lever is moved to condition the control means for causing said locking means to be operated and prior to any movement of the first named shiitable member."

. 39. Ina control mechanism for a change speed transmission provided with a member shiftable to two gear ratio operative'positions and aneutral f position, power means for shifting said member, control; means for said power means, manual means movable from an inoperative positionto another position for controlling the operativeness of said control meansso as to cause the power means to alternately shift the shiftable member from one operative position to another, another manual means having an inoperative position, and means for so conditioning the control means by amovem'ent or said other manual means to another position that said control means'can 'be controlled by the first manual means to cause the power means to alternately shift .the shiftable member, said control means being made operable.

tocause the power means to function regardless control valve means icr (5 of the sequence of movement or the first named manual means to its operative position and the movement-lot the second manual means to its said conditioningposition.

' means to alternately shift the shiftable member from one operative position to another, another manual means having an inoperative position,

means for so conditioning the control means by a movement of said other manual means to another position that said control means can be controlled by the first manual means to cause the power means to alternately shift the shiftable member, said control means being made operable to cause the power means to function regardless of the sequence of movement of the flrst named manual means to its operative position and the movement of the second manual means to its said conditioning position, and means operable by said other manual means when returned to its inoperative position for disabling the control means and for manually shifting said shiftable member to neutral position by manual efiort.

41. In a control mechanism for a change speed transmission provided. with a member shiftable to two gear ratio operative positions and to a neutral position, means for shifting said member comprising a fluid motor having a movable element, means for connecting said movable element to the shiftable member so that the movable element of the fluid-motor will be in a central posltion between its limits of reciprocable movement when the shiftable member is in neutral position and will cause the gear ratios to be operative when moved in opposite directions from said central position, control means operable at will for causing the movable element of said fluid motor 4 to move in opposite directions, manual means having a. normally inoperative position, means operable by said manual means when moved from said normally inoperative position for conditioning the control means so that it can control the fluid motor, and means operable by said manual means when returned to its normally inoperative position for disabling the control means for the fluid motor, for manually restoring the movable element of the fluid motor to its central position and for manually 'moving' the shiftable member to its neutral position.

42. In a control mechanism for a change speed gearing having a member shiftable to two gear ratio operative positions and to a neutral position, a fluid motor having a movableelement connected for shifting said member, a source of dif- 5 ferential fluid pressure, control means including valve means having a normally inoperative position and other operative positions for connecting the fluid motor to the source to cause the movable element to be moved in opposite directions, a manually-operated member, means operable by a movement of the manually-operated member for so moving the valve means that the fluid motor will be operated to cause one speed ratio to be operative and operable by a like successive move-'- ment of vthe manually-operated member for so moving the valve means that the fluid motor will be connected to the source to cause the other speed ratio to be operated, said last named means embodying means controlled by the position of the movable element of the fluid motor for determining to which of the two positions said valve means wil1 be moved by th manually-operated member, and means for restoring the valve means to its normal position after each movement of the manually-operated means.

43. In a control mechanism for a change speed gearing having a fluid motor the movable element of which is shiftable in opposite directions for causing either of two speed ratios to be operative,

valve means for connecting both ends of the fluid motor to atmosphere or either end to the source, means for normally. positioning the valve means so that both ends of the fluid motor are connected to atmosphere, a manually-operated member, means operable by a reciprocable movement of the'manually-operated member for so moving the valve means that one end of the fluid motor is connected to the source whereby said motor will 40 cause one speed ratio to be operative and operable by a like successive reciprocable movement of n the manually-operated member for so moving the valve means that the other end of the fluid motor I is connected to the source whereby said motor a will cause the other speed ratio to be operative,

trolled by the position of the movable element of the fluid motor for determining which end of the fluid motor will be connected to thesource 0 by the valve means, and means for restoring the valve means to its normal position after each reciprocation of the manually-operated member.

GLENN T. RANDOL.

a source of diflerential fluid pressure, control said last named means embodying means conv 

